BIOLOGY AND DAMAGE ASSESSMENT OF DIFFERENT STORED GRAINS INFESTED BY RICE MOTH, CORCYRA CEPHALONICA (STAINTON) IN THE LABORATORY

Abstract

Two sets of experiment were conducted in the laboratory of the Department of Entomology, Sher-e-Bangla Agricultural University, Dhaka-1207 during the period from May to August, 2017 to study biology and damage assessment of different stored grains infested by rice moth, Corcyra cephalonica (Stainton) in the laboratory. As experimental materials husked rice was used for biology study and husked rice, wheat and flatted rice were used for damage assessment. The female adult moth lays 169-280 eggs with an average of 240 eggs throughout its life span. The duration of oviposition, incubation, larval and pupal periods of rice moth were 4.0±0.32, 4.20±0.37, 19.00±0.7 and 7.80±0.37 days respectively. The adult longevity was found 9.00 ± 0.89 days for male and 10.80 ± 0.97 days for females. The larval and pupal length was 10.40±0.51mm and 8.60±0.24mm and width was 3.20±0.37 and 3.40±0.40mm respectively. Adult male and female wing span, length and width were 11.00±0.32mm and12.40±0.24mm and 11.20±0.37mm and12.40±0.24mm respectively. At 1st generation in weight basis, the highest infestation was recorded on husked rice (1.30%) and weight loss(0.67%) and the lowest infestation was recorded on flatted rice (0.48%) and weight loss (0.3o%). At 2nd generation in weight basis, the highest infestation was recorded on husked rice (7.06%) and weight loss (2%) and the lowest infestation was recorded on flatted rice (3.71%) and weight loss (0.90%).